implemented client removal

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

de.srsoftware.oidc.web/src/main/resources/en/clients.html

@@ -11,19 +11,25 @@
 <nav>
     <a id="clients" href="clients.html">Clients</a>
 </nav>
-<h1>Welcome!</h1>
-<h2>Clients</h2>
+<h1>Clients</h1>
+
 These are clients that are registered with LightOIDC:
 <table>
     <tr>
         <th>Client</th>
+        <th>ID</th>
+        <th>Redirect URLs</th>
         <th>Actions</th>
     </tr>
-    <tr>
+    <tr id="bottom">
+        <td></td>
+        <td></td>
+        <td></td>
         <td>
             <button onclick="window.location.href='newclient.html';">Add new client…</button>
         </td>
     </tr>
 </table>
+<span class="hidden" id="message">Really remove client "{}"?</span>
 </body>
 </html>